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ext4: async direct IO for holes and fallocate support

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For async direct IO that covers holes or fallocate, the end_io
callback function now queued the convertion work on workqueue but
don't flush the work rightaway as it might take too long to afford.

But when fsync is called after all the data is completed, user expects
the metadata also being updated before fsync returns.

Thus we need to flush the conversion work when fsync() is called.
This patch keep track of a listed of completed async direct io that
has a work queued on workqueue.  When fsync() is called, it will go
through the list and do the conversion.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
This commit is contained in:
Mingming Cao
2009-09-28 15:48:29 -04:00
committed by Theodore Ts'o
parent 4c0425ff68
commit 8d5d02e6b1
5 changed files with 234 additions and 41 deletions
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8
fs/ext4/super.c
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@@ -687,6 +687,8 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->i_allocated_meta_blocks = 0;
ei->i_delalloc_reserved_flag = 0;
spin_lock_init(&(ei->i_block_reservation_lock));
INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
ei->cur_aio_dio = NULL;
return &ei->vfs_inode;
}
@@ -3375,11 +3377,13 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
{
int ret = 0;
tid_t target;
struct ext4_sb_info *sbi = EXT4_SB(sb);
trace_ext4_sync_fs(sb, wait);
if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
flush_workqueue(sbi->dio_unwritten_wq);
if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
if (wait)
jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
jbd2_log_wait_commit(sbi->s_journal, target);
}
return ret;
}